package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    //1.用户名与密码是否正确 2.条件1成立的情况下，账户还不能是被禁用的状态才可以。
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // 对前端传过来的密码进行md5加密，然后再进行比对
        password=DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }


    /**
     * 新增员工
     * @param employeeDTO
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        //对象属性拷贝（当二者属性名一致时可使用）
        BeanUtils.copyProperties(employeeDTO,employee);
        //有一些属性DTO里面没有，所以需要单独给Employee设置
        //设置账户的状态，默认状态为1表示正常，0表示锁定
        employee.setStatus(StatusConstant.ENABLE);

        //设置密码，对密码进行md5加密处理
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        //88-94行的赋值已经通过AOP动态赋值实现（面向切面编程)
        //设置当前记录的创建时间和修改时间
        //employee.setCreateTime(LocalDateTime.now());
        //employee.setUpdateTime(LocalDateTime.now());

        //设置当前记录创建人id和修改人id
        //employee.setCreateUser(BaseContext.getCurrentId());
        //employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.insert(employee);

    }

    /**
     * 分页查询方法
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        //select * from employee limit 0,10
        //开始分页查询
        //第一个参数：页码，第二个参数:每页的记录数
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());

        Page <Employee> page =employeeMapper.pageQuery(employeePageQueryDTO);
        long total = page.getTotal();
        List<Employee> records = page.getResult();
        return new PageResult(total,records);
    }

    /**
     * 启用禁用员工账号
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //update employee set status = ? where id = ?
        /*
        法一：Employee employee = new Employee();
        employee.setStatus(status);
        employee.setId(id);
         */

        //法二：build构建器（在employee实体类上方已加入build注解）
        //将数据信息:id和status封装成对象，并传给数据层(mapper)
        Employee employee = Employee.builder()
                .status(status)
                .id(id)
                .build();
        //调用持久层
        employeeMapper.update(employee);
    }

    /**
     *根据id查询员工信息
     */
    @Override
    public Employee getById(Long id) {
        Employee employee=employeeMapper.getById(id);
        employee.setPassword("****");
        //让后端传给前端的密码再次加密成****,不给别人看。
        return employee;
    }

    /**
     * 编辑员工信息
     */
    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);

        //163-164行的赋值已经通过AOP动态赋值实现（面向切面编程)
        //补充employee的属性,因为employee中存在一些employeeDTO中没有的属性
        //employee.setUpdateTime(LocalDateTime.now());
        //employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.update(employee);
    }
}
